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Table 3 Comparison of demographics of the Statistics Netherlands (CBS), web and telephone sample

From: Is web interviewing a good alternative to telephone interviewing? Findings from the International Tobacco Control (ITC) Netherlands Survey

  CBS sample
(n = 4,133)
Web sample
(n = 1,668)
Telephone sample
(n = 404)
Significance tests
     CBS versus
web
CBS versus
telephone
Gender (%)     χ2 = 0.16 χ2 = 1.30
Men 54.2 52.6 55.3 (df = 1) (df = 1)
Women 45.8 47.4 44.7   
Marital status (%)     χ2 = 104.68*** χ2 = 32.82***
Not married 33.1 44.2 43.6 (df = 3) (df = 3)
Married 50.2 47.7 48.3   
Widowed 5.1 2.0 4.2   
Divorced 11.7 6.1 3.9   
Educational level (%)     χ2 = 20.14*** χ2 = 95.34***
Low 46.5 50.8 35.0 (df = 3) (df = 3)
Middle 36.7 35.1 47.4   
High 16.6 13.3 13.9   
No answer 0.3 0.8 3.7   
  1. * p < 0.05
  2. ** p < 0.01
  3. *** p < 0.001